Fire-alarm



J. T. DELANEY.

FIRE ALARM.

APPLICA TION FILED JAN.20, 1920.

Patented Feb. 8, 1921.

' A TTOHNEY Mm WW MNM A v WITNESSES:

UNITED STATES NECTICUT.

PATENT OFFICE.

JAMES '1. DELANEY, F BRIDGEPORT, CO NNEGTICUT ASSIGNOR TO THE EMOA MANU- FACTURING COMPANY, OF BRIDGEPORT, CONHECTICUT, A CORPORATION OF GON- rmaanama.

"Patented Feb. 8; 1921.

Application flied January 20, 1920. Serial No. 352,870.-

To aZZw/wm it may concern:

Be it known that I, JAMES T. DELANEY,

This invention relates to the class of fire alarms illustrated and described in patent to Bowman, No. 1,162,020, dated November 30, 1915, and in my copending application,

Serial No. 329,47 6, filedOctober 9, 1919, said alarms being'adapted for general use, as

in homes, factories warehouses and garages, in fact, wherever life and property are in danger from fire. The present invention further contemplates an alarm which will be operative in caseswhere the danger may be from water, gas, or other cause or influence. It is also an ob'ect of the invention to construct an alarm 0 this character which 'will be reliable and practically certain of operation for a long period without any attention whatever.

With "these and other objects in view, I have devised the novel'alarm which I will now describe and hereinafter specifically claim.

In the accompanying drawing part of this specification,

Figure 1 is a front elevation of my novel forming a alarm as in use;

Fig. 2 a side elevation'corresponding with Fi 1' l i 3 a fragmentary sectional view showing 51c plug 1n open circuit position;

{Fig 4 a fragmentar sectional view showin the plug in close circuit position;

Tig. 5a view showing the alarm in front elevation, and in connection therewith a diagrammatic view of an electric bell, battery and wiring system;

Fig. 6 a fra mentary sectional view of the lower end of t e tubular case, the cap therefor, and the connection between the case and ca and Fig. l is a perspective view of the destructible wafer of my invention.

It should be understood that the invention resides in'mechanism adapted to be made operative by the action of heat, water,gas, or other influencing condition or material, for causing any ordinary or preferred form it is immaterial sd far as the present invention is concerned what special form of electrically operated noise producing or other signalmg apparatus is used. Inthe present instance I have shown an electric hell or buzzer, indicated by 10, a conventional wiring system, indicated by 11, and a'battery,

indicated by 12.

The parts of the present invention are carmed by an insulating base board 13 which may be secured in place wherever required.

14 denotes a tubular metallic case open at its lower end and having a removable cap 15 secured thereto in any convenient manner, as b .means of a bayonet joint 16. To the cap is attached one end of a relatively strong spring 17, and to the other end of the spring is attached a plug 18 having at its lower end an enlarged sleeve 19 which is adapted to freely slide within the.case, and at its outer end a conical tip 20. The upper end of the case has a circular opening 'therein,as shown at 21, and through this opening the plug is adapted to slide freely. The plug and the sleeve, or the case or both, are made of non-oxidizable metal, or are rendered non-oxidizable, so as to insure that the plug and sleeve will not stick in the case when released.

The destructible wafer, indicated by 22, is of a shape to fit in the upper end of the metallic case, and of a thickness to hold the plug in the open circuit position. The wafer has a circular opening through its center, the diameter of which is approximately equal to that of the circular opening in the upper end of the case. The plug passes through the wafer and its flared portion rests against the lower wall thereof. The plug is thus held in its open circuit position and the" spring held compressed. The wafer is made of material suitable for the panticular use to which the device is to be put, the material being different for difi'erent uses. For example, when the device is used as a fire alarm, the wafer may be made of a suitable low melting material;'as an indicator for water, it may be made of a suitable material which water will dissolve; and as an indicator for gas, it may be madeof a suitable material which will be chemically. 10a

or condition to be guarded against, and at 28 are shown holes which may be made in the plug to provide an outlet for the water as it is being destroyed.

The case is secured to the base board by means of a suitable clip or bracket 23 which incloses and grips the case and is attached to the base board by screws 24. Above the case is a contact member 25 which is a strip of metal secured to the insulating base board by screws 26. Through the free end of the strip is a circular opening 27 into which the conical tip of the plug passes when the spring acts,'the tip then engaging the wall of the circular opening, as shown in Fig. 4, thus insuring effective electrical connection. The electric circuit is completed by attaching one of the wires to one of the clip screws 24 and the other wire to one of the retaining screws 26 for the contact member. 7

The parts will remain in the position shown in Figs. 1, 2, 3 and 5 under ordinary conditions and the circuit will be open. The destruction of the water by influence of the material or condition guarded against will allow the spring to force the conical tip into engagement with the contact member, thus closing the circuit. The circuit will remain closed until the alarm has effected its purpose and the plug has been returned to its open circuit position. To thus return the plug, the bayonet joint is disconnected and the cap, spring and plug are withdrawn from the case. A new destructible wafer is slipped overthe conical tip of the plug and pushed down against the flared portion thereof, the parts are replaced in the tubular metallic'case and the bayonet joint connected. The device is then ready for reuse.

What I desire to claim is 1. An alarm of the character described,

comprising a case having an opening through its upper end and a removable cap on its lower end, a spring carried by the cap, a plug adapted to be raised by the spring, a destructible wafer located in the case and carried by the plug and holding it against the action of the spring, and a contact member adapted to be engaged by the plug when the latter is released by destruction of thewafer.

2. An alarm or the character described, comprising a case having an opening through .its upper end and a' removable cap on its lower end, a spring carried by the cap, a plug carried by the spring and adapted to be raised thereby, a destructible wafer located in the case and encircling the plug and holding it against the action of the spring, and a contact member adapted to be engaged by the plug when the latter. is released by the Wafer.

3. An alarm'of the character described,

comprising a case having an opening through its upper end and a removable cap on its lower end, a spring carried by the cap, a plug carried by the spring and adapted to be raised thereby, a destructible wafer located in the case and holding the plug against the action of the spring, and a contact member adapted to be engaged by the plug when the wafer allows the spring to act.

4:. An alarm of the character described, comprising a case having an opening through its upper end and a removable cap on its lower end, a spring carried by the cap, a plug carried by the spring and adapted to be raised thereby, said plug having a conical tip and a sleeve adapted to freely slide in said case, a destructible wafer holding said plug against the action of said spring, and a contact member adapted to be engaged by said plug when the latter is released by destruction of said wafer.

5. An alarm of the character described, comprising a case having an opening through its upper end and a removable cap on its lower end, a spring carried by the cap, a plug carried by the spring and adapted to be raised thereby, said plug having a conical tip and a sleeve adapted to freely slide in said case, a destructible wafer located in the case for holding said plug against the action of said spring, and a contact member adapted to be engaged by the plug when the wafer allows the spring to act.

6. An alarm of the character described, comprising a case having an opening through its upper end and a removable cap on its lower end, a spring carried by the cap, a plug carried by the spring and adapted to be raised thereby, said plug having a conical tip and a sleeve adapted to freely slide in said case, a destructible wafer located in the case for holding said plug against the action of said spring, and a contact member adapted to be engaged by said; conical.tip when said plug is re leasedby said wafer.

7, An alarm of the character described, comprising a case having an opening through its upper end and a removable cap'on its lower end, a spring carried by the cap, a plug carried by the spring and adapted to be raised thereby, said plug having a conical tip and a sleeve adapted to freely slide in said case, a destructible wafer located in the case for holding the plug against the action of the spring, and a contact member adapted to be en aged by the conical tip when the wafer 1s destroyed.

In testimony whereof I afiix my signature.

JAMES T. DELANEY. 

